This was from a quick google search, there are probably more sources and more stories about the others you mentioned. There is no one candidate to blame here, most of them have some sort of story they concoct about why they lost and some conspiracy they attribute it to. The blame lies with anyone who is such a tribal political member (D or R) that they simply cannot accept anything non-nightmarish about the other side.
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This is HC in 2020 claiming that 2016 was illegitimate: https://news.yahoo.com/hillary-clinton-maintains-2016-electi...
This was from a quick google search, there are probably more sources and more stories about the others you mentioned. There is no one candidate to blame here, most of them have some sort of story they concoct about why they lost and some conspiracy they attribute it to. The blame lies with anyone who is such a tribal political member (D or R) that they simply cannot accept anything non-nightmarish about the other side.
Hillary Clinton conceded the election the morning after the election, publicly asking her supporters to welcome Trump into office.